熱軋態與回火態AH80DB低碳貝氏體鋼組織與沖擊韌性

趙雷超; 孫斌堂; 黃運華; 張施琦; 丁一; 閆小琴; 張躍

doi:10.13374/j.issn2095-9389.2016.03.009

熱軋態與回火態AH80DB低碳貝氏體鋼組織與沖擊韌性

doi: 10.13374/j.issn2095-9389.2016.03.009

1. 北京科技大學材料科學與工程學院, 北京 100083;
2. 北京科技大學新材料技術研究院, 北京 100083;
3. 長江大學機械工程學院, 荊州 434023

基金項目:

中央高校基本科研業務費資助項目(FRF-As-13-001A)

教育部創新團隊和新世紀人才計劃資助項目(IRT1106)

詳細信息

通訊作者:
閆小琴,E-mail:xqyan@mater.ustb.edu.cn

中圖分類號: TG142.2
計量
- 文章訪問數: 384
- HTML全文瀏覽量: 131
- PDF下載量: 16
- 被引次數: 0
出版歷程
- 收稿日期: 2015-01-23
- 網絡出版日期: 2021-07-10

Microstructure and impact toughness of hot rolled and tempered low carbon bainitic steel AH80DB

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;
3. College of Mechanical Engineering, Yangtze University, Jingzhou 434023, China

摘要

摘要:
采用光學顯微鏡、掃描電子顯微鏡和透射電子顯微鏡對熱軋態和回火態AH80DB低碳貝氏體鋼的顯微組織、馬氏體/奧氏體（M/A）島、第二相的析出行為以及晶界取向差、有效晶粒尺寸進行研究,揭示回火后低碳貝氏體鋼沖擊韌性得到改善的原因.結果表明：兩種試樣的組織均由板條狀貝氏體、粒狀貝氏體和針狀鐵素體組成,其中回火態試樣中針狀鐵素體組織較多.熱軋態鋼中存在較大尺寸M/A島且呈方向性分布,大角度晶界比例占17.33%,有效晶粒尺寸為3.57μm;而回火態鋼中M/A島的尺寸較小,大角度晶界比例增加3.43%,有效晶粒尺寸減小0.56μm.熱軋態鋼中析出相主要是（Nb,Ti）C,尺寸在50~150 nm之間,回火態試樣中析出較多細小的球狀（Nb,Ti）C析出相,尺寸在10 nm左右.
- 低碳鋼 /
- 貝氏體 /
- 沖擊韌性 /
- 顯微組織 /
- 析出相
Abstract:
The microstructure,martensite/austenite(M/A) islands,precipitated phases,high-angle grain boundaries and effective grain size of hot rolled and tempered low carbon bainitic steel AH80 DB were studied by scanning electron microscopy(SEM),transmission electron microscopy(TEM) and electron back-scattered diffraction(EBSD). The reason for the improvement in impact toughness of the low carbon bainitic steel after tempering was discovered. The results show that the microstructures of both the samples mainly consist of lath bainite,granular bainite and acicular ferrite. There is more acicular ferrite in the tempered steel. Coarse M/A islands are found in the hot rolled steel and its distribution is directional,the ratio of large-angle grain boundaries is 17.33%,and the average effective grain size is 3.57 μm. Nevertheless,the size of M/A islands decreases after tempering. Besides,the ratio of largeangle grain boundaries increases by 3.43% and the average effective grain size decreases by 0.56 μm after tempering. The precipitated phase of the hot rolled steel is(Nb,Ti) C with the size of 50-150 nm,while much small and spherical precipitates with the size of about 10 nm appear after tempering.
- low carbon steel /
- bainite /
- impact toughness /
- microstructure /
- precipitation